Uh, I don't think there's a McDonalds in EPCOT, there is simply a stand to get nuggets and fries. No burgers, and I don't think they have happy meals. Here's a link to thier menu:
The only McDonalds' restaurants on property are in the DTD Marketplace and over by the All-Stars. Those are the only places that you could get a Happy Meal.
There are a couple of places in the theme parks that serve McD's fries. Some of those fry stands also have McNuggets. The one in Epcot is just a tiny little stand.